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Astronomers spot leftover light from ancient stars

Photons leave their mark in high-energy radiation from powerful galaxies

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5:05pm, November 1, 2012

Light from the universe’s very first stars still lingers in space. Now, astronomers have a new way to catch it: Distant, ultra-bright galaxies that act as cosmic beacons, capturing relict photons in a blaze of gamma rays.

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